FDFCC-Ⅲ工艺加工焦化汽油的工业实践
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摘要
焦化汽油辛烷值低、安定性差,烯烃和硫含量高,不能作为汽油的调合组分直接出厂。随着国家对环境保护的日益重视,对汽油的质量要求不断提高,需要采用简单易行的加工方法对焦化汽油进行改质,提高其辛烷值、降低烯烃和硫含量,同时加工损失又较小。中国石化洛阳工程公司研发的FDFCC-Ⅲ工艺,由于设置第二提升管,对于加工焦化汽油具有独特优势。第二提升管为焦化汽油催化改质反应提供了独立的反应场所,可以灵活、多方案地实现焦化汽油的加工。在改质反应温度550℃条件下,焦化汽油经第二提升管改质后,汽油保留率为72.78%,液化石油气+改质汽油+柴油收率为94.44%,焦炭产率为2.21%,干气产率为2.72%。同时汽油性质得到明显改善,RON辛烷值提高11个单位,脱硫率达到78.0%,脱氮率达到91.8%,且改质汽油烯烃含量大幅度下降,诱导期延长,为焦化汽油的利用提供了一条简单易行的工艺路线。
Coker naphtha has low octane value,poor safety and high contents of olefin and sulfur and therefore cannot be directly used as a gasoline blending component.As it attaches increasing importance to envi-ronmental protection,China has increasingly strict requirements for the quality of gasoline.Refiners need to up-grade coker naphtha to increase its octaine value,reduce olefin and sulfur contents and lower processing loss using simple and easy procesing methods.The FDFCC- Ⅲ process developed by Sinopec Luoyang Engineering Company has its unique advantages over other similar products when used for processing coker naphtha as it is equipped with a second riser.The addition of the second risr has provided a standalone reaction place for the catalytic upgrade of coker naphtha,enabling flexible and multiple ways of coker naphtha processing.When the reaction temperature is 550 ℃,the gasoline retention rate after coker naphtha was upgraded through the second riser reaches 72.78%,the combined yield of LPG,upgrade gasoline and diesel fuel is 94.44%,the coke yield is 2.21% and the dry gas yield is 2.72%.The properties of gasoline improved considerably — RON increased by 11 units,78.0% of sulfur was removed,and 91.8% of nitrogen was removed.In addition,the content of olefin in the upgraded gasoline dropped significantly and the induction period extended.The up-grade has offered a simple and easy route for the utilization of coker naphtha.
Coker naphtha has low octane value,poor safety and high contents of olefin and sulfur and therefore cannot be directly used as a gasoline blending component.As it attaches increasing importance to envi-ronmental protection,China has increasingly strict requirements for the quality of gasoline.Refiners need to up-grade coker naphtha to increase its octaine value,reduce olefin and sulfur contents and lower processing loss using simple and easy procesing methods.The FDFCC- Ⅲ process developed by Sinopec Luoyang Engineering Company has its unique advantages over other similar products when used for processing coker naphtha as it is equipped with a second riser.The addition of the second risr has provided a standalone reaction place for the catalytic upgrade of coker naphtha,enabling flexible and multiple ways of coker naphtha processing.When the reaction temperature is 550 ℃,the gasoline retention rate after coker naphtha was upgraded through the second riser reaches 72.78%,the combined yield of LPG,upgrade gasoline and diesel fuel is 94.44%,the coke yield is 2.21% and the dry gas yield is 2.72%.The properties of gasoline improved considerably — RON increased by 11 units,78.0% of sulfur was removed,and 91.8% of nitrogen was removed.In addition,the content of olefin in the upgraded gasoline dropped significantly and the induction period extended.The up-grade has offered a simple and easy route for the utilization of coker naphtha.
引文
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[2]陈曼桥,孟凡东.增产丙烯和生产清洁汽油新技术——FDFCC-Ⅲ工艺[J].石油炼制与化工,2008,39(9):1-5.
[3]陈俊武,曹汉昌.催化裂化工艺与工程[M].北京:中国石化出版,2005.
[4]闫鸿飞.FDFCC-Ⅲ工艺汽油提升管汽油降硫影响因素研究[J].河南化工,2010,27(19):47-49.
[5]赵日峰.焦化汽油进催化装置提升管反应器改质技术分析[J].金陵石油化工,1997(2):37-39.
[6]张国才.焦化汽油的催化裂化改质[J].石油炼制与化工,2001,32(4):5-9.